Oceanic bromoform sources for the tropical atmosphere.

Quack, Birgit, Atlas, E., Petrick, Gert, Stroud, V, Schauffler, S. and Wallace, Douglas W.R. (2004) Oceanic bromoform sources for the tropical atmosphere. Open Access Geophysical Research Letters, 31 (23). L23S05. DOI 10.1029/2004GL020597.

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Abstract

Oceanic bromoform (CHBr3) is the major source of organic Br to the atmosphere and may be significant for ozone depletion through the contribution of reactive bromine to the upper troposphere and lower stratosphere of the midlatitudes and tropics. We report the first analyses of boundary layer air, surface and deep ocean waters from the tropical Atlantic. The data provide evidence of a source of CHBr3 throughout the tropical open ocean associated with the deep chlorophyll maximum within the tropical thermocline. Equatorial upwelling carries the CHBr3 to the surface, adding to increased concentrations in the equatorial mixed layer and driving oceanic emissions that support locally elevated atmospheric concentrations. In air masses that had crossed the coastal upwelling region off NW Africa even higher atmospheric mixing ratios were measured. The observations suggest a link between climate, wind-driven upwelling, and the supply of Br to the upper atmosphere of the tropics.

Document Type: Article
Keywords: Air/Sea Constituent Fluxes; Biosphere/Atmosphere Interactions; Constituent Sources and Sinks; Gases; Oceans
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2004GL020597
ISSN: 0094-8276
Date Deposited: 10 Feb 2010 15:31
Last Modified: 27 Feb 2018 13:01
URI: http://oceanrep.geomar.de/id/eprint/4297

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